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View Full Version : Backfire through throttle body

mopar rt
08-26-2004, 11:01 AM
When I get on it sometimes I will hear a popping through the throttle body. The truck runs great other then that. Any ideas?
2Evil4U
08-28-2004, 01:25 PM
Do you notice the truck bucking when you hear this? If so, I'd start with either detonation, or ignition timing.

Are you using the recommended octane gas?
mopar rt
08-28-2004, 02:15 PM
The truck will lay down for a split second then recover but only after I let off of it. Would a colder plug help or do I need to use a Jet chip or Hypertec to adjust the timing?
Blowndakrt
08-28-2004, 07:53 PM
Have you recently added or have the M-1 intake?

Shawn
mopar rt
08-28-2004, 11:14 PM
Yes I have installed the MI but it has been on for a while. I had some troubles with it at first but I had it port matched to the heads and it ran great after that.
kaui56
08-29-2004, 03:34 AM
i would say your timing is off...maybe you put the distributor in wrong when you installed the m1.
Blowndakrt
08-29-2004, 06:33 AM
Well another common problem after installing the M-1 is the backfire through the TB. You can go to the dealer and have them check your fuel sync. Should be around 0 or +1. Another way to help is to run a dedicated line to the map sensor off the M-1. You will need to pull the elbow off the underside of your TB and put a cap on the barb going into the TB. Then run a line directly to the map sensor itself off the M-1.


Shawn
Blowndakrt
08-29-2004, 06:36 AM
"i would say your timing is off...maybe you put the distributor in wrong when you installed the m1."

The distributor doesn't have to be removed to install the M-1. So I don't know if it was taken out for another reason. But timing is pretty easy to check too. So might be worth a shot for peace of mind.


Shawn
mopar rt
08-30-2004, 11:41 AM
Never pulled the dist out for the install. The problem started long after the MI was put in. Could it be the throttle position sensor?
MNBiker
07-18-2005, 04:43 PM
Well, as much as I hate pulling up an old thread, my 99 Durango Slt 5.9 is suffering from this same problem. Mine is all stock. It started backfiring a couple months ago, and has slowly gotten worse. I replaced the dist cap and rotor and have replaced the plenum gasket. It got new 3923 plugs about 8000 miles ago. My next step is going to be a leak down test and new plugs and wires. Just wondering if you found a resolution for your problem?
Thanks.